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Abstract:

A radio base station according to the present invention comprising: a
simulator device including a downlink signal output unit configured to
transmit a downlink signal for a first cell, and a downlink signal for a
second cell, in the form of a simulation signal, to a mobile station, in
which the downlink signal output unit is configured to shift a lead
position of a radio frame from which to transmit the downlink signal for
a first cell and a lead position of a radio frame from which to transmit
the downlink signal for a second cell.

Claims:

1. A simulator device, comprising a downlink signal output unit
configured to transmit a downlink signal for a first cell and a downlink
signal for a second cell, in the form of a simulation signal, to a mobile
station, wherein the downlink signal output unit is configured to shift
the lead position of a radio frame from which to transmit the downlink
signal for a first cell and the lead position of a radio frame from which
to transmit the downlink signal for a second cell.

2. A simulator device, comprising a downlink signal output unit
configured to transmit a downlink signal for a first cell including a
downlink control signal and a downlink data signal and to transmit a
downlink signal for a second cell including a downlink control signal and
a downlink data signal, in the form of a simulation signal, to a mobile
station, wherein the downlink signal output unit is configured to align a
boundary of a subframe in a first radio frame from which to transmit the
downlink signal for a first cell and a boundary of a subframe in a second
radio frame from which to transmit the downlink signal for a second cell,
and the downlink signal output unit is configured to make the number of
OFDM symbols used for transmitting the downlink control signal and the
downlink data signal in each subframe within the first radio frame equal
to the number of OFDM symbols used for transmitting the downlink control
signal and the downlink data signal in each subframe within the second
radio frame.

3. A simulator device, comprising: a physical cell ID assignment unit
configured to assign a physical cell ID to a first cell and a second
cell; and a downlink signal output unit configured to transmit the
downlink signal for a first cell by a first frequency direction resource
determined by a physical cell ID imparted to the first cell, and to
transmit the downlink signal for a second cell by a second frequency
direction resource determined by a physical cell ID imparted to the
second cell, in the form of a simulation signal, to a mobile station,
wherein the physical cell ID assignment unit is configured to assign the
physical cell ID to the first cell and the second cell so that the first
frequency direction resource and the second frequency direction resource
do not overlap.

4. A simulator device, comprising: a resource assignment unit configured
to assign a first frequency direction resource by which to transmit a
downlink data signal for a first cell, and a second frequency direction
resource by which to transmit a downlink data signal for a second cell;
and a downlink signal output unit configured to transmit, the downlink
data signal for a first cell by the first frequency direction resource,
and the downlink data signal for a second cell by the second frequency
direction resource, in the form of a simulation signal, to a mobile
station, wherein the resource assignment unit is configured not to assign
a predetermined number of frequency direction resources centered on the
frequency direction resource in the center, out of the frequency
direction resources that can be used for transmitting the downlink signal
for a first cell and the downlink signal for a second cell, as the first
frequency direction resource and the second frequency direction resource.

5. A simulation method, comprising a step of transmitting a downlink
signal for a first cell, and transmitting a downlink signal for a second
cell, in the form of a simulation signal, to a mobile station, wherein in
the preceding step, the lead position of a radio frame from which to
transmit the downlink signal for a first cell is shifted from the lead
position of a radio frame from which to transmit the downlink signal for
a second cell.

6. A simulation method, comprising a step of transmitting a downlink
signal for a first cell including a downlink control signal and a
downlink data signal, and transmitting a downlink signal for a second
cell including a downlink control signal and a downlink data signal, in
the form of a simulation signal, to a mobile station, wherein in the
preceding step, the boundary of a subframe in a first radio frame from
which to transmit the downlink signal for a first cell, is aligned to the
boundary of a subframe in a second radio frame from which to transmit the
downlink signal for a second cell, and in the preceding step, the number
of OFDM symbols used for transmitting the downlink control signal and the
downlink data signal in each subframe within the first radio frame is
made equal to the number of OFDM symbols used for transmitting the
downlink control signal and the downlink data signal in each subframe
within the second radio frame.

7. A simulation method, comprising: a step A in which a physical cell ID
is assigned to a first cell and a second cell; and a step B in which the
downlink signal for a first cell is transmitted by a first frequency
direction resource determined by a physical cell ID imparted to the first
cell, and the downlink signal for a second cell is transmitted by a
second frequency direction resource determined by a physical cell ID
imparted to the second cell, in the form of a simulation signal, to a
mobile station, wherein in the step A, the physical cell ID is assigned
to the first cell and the second cell so that the first frequency
direction resource and the second frequency direction resource do not
overlap.

8. A simulation method, comprising: a step A of assigning a first
frequency direction resource by which to transmit a downlink data signal
for a first cell, and a second frequency direction resource by which to
transmit a downlink data signal for a second cell; and a step B of
transmitting the downlink data signal for a first cell by the first
frequency direction resource, and the downlink data signal for a second
cell by the second frequency direction resource, in the form of a
simulation signal, to a mobile station, wherein in the step A, a
predetermined number of frequency direction resources centered on the
frequency direction resource in the center are not assigned, out of the
frequency direction resources that can be used for transmitting the
downlink signal for a first cell and the downlink signal for a second
cell, as the first frequency direction resource and the second frequency
direction resource.

Description:

TECHNICAL FIELD

[0001] The present invention relates to a simulator device and a
simulation method.

BACKGROUND ART

[0002] A radio communication scheme of an LTE (Long Term Evolution) scheme
assumes the use of a simulator device configured to simulate the
operation of a radio base station eNB of the LTE scheme, for the purpose
of verifying if the operation of a mobile station UE supported by the LTE
scheme matches the content of the 3GPP standard.

[0003] In general, the simulator device needs to include a function of
simulating the operation in a plurality of cells in order to simulate the
operation, during cell reselection and the operation during handover.

[0004] In order to determine the cell reselection destination cells and
handover destination cells, the mobile station UE is configured to
perform a measurement process (Measurement) on the received power of a
downlink signal in a plurality of cells.

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

[0005] According to 3GPP, during the above-mentioned measurement process
of the mobile station UE, for example, as shown in Table 9.1.2.2-1 of
TS36.133, the relative accuracy of measurement (A) among the cells using
the same frequency is desired to be "±3 dB".

[0006] Note that as a prerequisite (B) for satisfying the said accuracy of
measurement, for example, the fulfillment of the condition "Es/Iot>-6
dB" is stipulated. Here, "Es" is the desired received power of each
resource element of the said cell, and "Iot" is the interference power
exerted on the unit resource element (including the noise and
interference power from other cells).

[0007] Furthermore, when simultaneously simulating a plurality of cells,
the simulator device has an uncertainty (C) of approximately "±1 dB",
for example, with respect to the relative transmission power among the
cells.

[0008] Thus, when the simulator device simultaneously simulates a
plurality of cells, in order to accurately verify the operation during
handover in the mobile station UE, the transmission power of the downlink
signal for each cell must be determined in consideration of the
above-mentioned accuracy of measurement (A) and uncertainty (C) in such
way that the reversal phenomenon does not occur in the magnitude
correlation of the received power among the cells measured in the mobile
station UE. In other words, a large difference must be applied between
the transmission power of the downlink signal for each cell.

[0009] However, if a large difference is applied to the transmission power
of the downlink signal among the cells using the same frequency, the
cells with less transmission power exhibit "Es<<Iot", and
fulfillment of the above precondition (B) becomes difficult.

[0010] If the precondition (B) is not fulfilled, the fulfillment of the
accuracy of measurement (A) of the mobile station UE for the said cells
cannot be guaranteed, and therefore, the execution of the expected
operation during cell reselection and during handover cannot be
guaranteed, which then becomes a problem.

[0011] Therefore, the present invention is intended to overcome the
above-described problems. An object of the present invention is to
provide a simulator device and a simulation method by which it is
possible to verify the operation of a mobile station supporting the LTE
scheme.

Means for Solving the Problems

[0012] A gist of a first characteristic of the present invention is a
simulator device including a downlink signal output unit configured to
transmit a downlink signal for a first cell, and a downlink signal for a
second cell, in the form of a simulation signal, to a mobile station, in
which the downlink signal output unit is configured to shift a lead
position of a radio frame from which to transmit the downlink signal for
a first cell and a lead position of a radio frame from which to transmit
the downlink signal for a second cell.

[0013] A gist of a second characteristic of the present invention is a
simulator device including a downlink signal output unit configured to
transmit a downlink signal for a first cell including a downlink control
signal and a downlink data signal and to transmit a downlink signal for a
second cell including a downlink control signal and a downlink data
signal, in the form of a simulation signal, to a mobile station, in which
the downlink signal output unit is configured to align a boundary of a
subframe in a first radio frame from which to transmit the downlink
signal for a first cell and a boundary of a subframe in a second radio
frame from which to transmit the downlink signal for a second cell, and
the downlink signal output unit is configured to make the number of OFDM
symbols used for transmitting the downlink control signal and the
downlink data signal in each subframe within the first radio frame equal
to the number of OFDM symbols used for transmitting the downlink control
signal and the downlink data signal in each subframe within the second
radio frame.

[0014] A gist of a third characteristic of the present invention is a
simulator device including: a physical cell ID assignment unit configured
to assign a physical cell ID to a first cell and a second cell; and a
downlink signal output unit configured to transmit the downlink signal
for a first cell by a first frequency direction resource determined by a
physical cell ID imparted to the first cell, and to transmit the downlink
signal for a second cell by a second frequency direction resource
determined by a physical cell ID imparted to the second cell, to a mobile
station, in the form of a simulation signal, in which the physical cell
ID assignment unit is configured to assign the physical cell ID to the
first cell and the second cell so that the first frequency direction
resource and the second frequency direction resource do not overlap.

[0015] A gist of a fourth characteristic of the present invention is a
simulator device including: a resource assignment unit configured to
assign a first frequency direction resource by which to transmit a
downlink signal for a first cell, and a second frequency direction
resource by which to transmit a downlink signal for a second cell; and a
downlink signal output unit configured to transmit the downlink signal
for a first cell by the first frequency direction resource, and the
downlink signal for a second cell by the second frequency direction
resource, to a mobile station, in the form of a simulation signal, in
which the resource assignment unit is configured to divide the frequency
direction resources that can be used for transmitting the downlink signal
for a first cell and the downlink signal for a second cell, in the
frequency directions into a plurality of groups, and to assign one of a
plurality of divided groups, as the first frequency direction resource
and the second frequency direction resource, and the resource assignment
unit is configured such that the group assigned as the first frequency
direction resource is differed from the group assigned as the second
frequency direction resource.

[0016] A gist of a fifth characteristic of the present invention is a
simulator device including a downlink signal output unit configured to
transmit at least one of broadcast information for a first cell or a
synchronization signal within a first predetermined period, and to
transmit at least one of broadcast information for a second cell or a
synchronization signal within a second predetermined period, in the form
of a simulation signal, to a mobile station, in which the downlink signal
output unit is configured such that the transmission timing of the at
least one of broadcast information for a first cell or the
synchronization signal, is differed from the transmission timing of the
at least one of broadcast information for a second cell or the
synchronization signal.

[0017] A gist of a sixth characteristic of the present invention is a
simulator device including a downlink signal output unit configured to
transmit broadcast information for a first cell within a first
predetermined period, and to transmit a downlink signal for a second
cell, in the form of a simulation signal, to a mobile station, in which
the downlink signal output unit is configured to not transmit the
downlink signal for a second cell at the transmission timing of the
broadcast information for a first cell.

[0018] A gist of a seventh characteristic of the present invention is a
simulator device including a downlink signal output unit configured to
transmit a downlink data signal for a specific cell via a physical
downlink data channel, in the form of a simulation signal, to a mobile
station, in which the downlink signal output unit is configured, to stop
the transmission of the downlink signal via the physical downlink data
channel, when there is no downlink data signal for a specific cell that
should be transmitted.

[0019] A gist of an eighth characteristic of the present invention is a
simulator device including: a resource assignment unit configured to
assign, a first frequency direction resource by which to transmit a
downlink data signal for a first cell, and a second frequency direction
resource by which to transmit a downlink data signal for a second cell;
and a downlink signal output unit configured to transmit the downlink
data signal for a first cell by the first frequency direction resource,
and the downlink data signal for a second cell by the second frequency
direction resource, in the form of a simulation signal, to a mobile
station, in which the resource assignment unit is configured not to
assign a predetermined number of frequency direction resources centered
on the frequency direction resource in the center, out of the frequency
direction resources that can be used for transmitting the downlink signal
for a first cell and the downlink signal for a second cell, as the first
frequency direction resource and the second frequency direction resource.

[0020] A gist of a ninth characteristic of the present invention is a
simulation method including a step of transmitting a downlink signal for
a first cell, and transmitting a downlink signal for a second cell, in
the form of a simulation signal, to a mobile station, in which in this
preceding step, the lead position of a radio frame from which to transmit
the downlink signal for a first cell is shifted from the lead position of
a radio frame from which to transmit the downlink signal for a second
cell.

[0021] A gist of a tenth characteristic of the present invention is a
simulation method including a step of transmitting a downlink signal for
a first cell including a downlink control signal and a downlink data
signal, and transmitting a downlink signal for a second cell including a
downlink control signal and a downlink data signal, in the form of a
simulation signal, to a mobile station, in which in this preceding step,
the boundary of a subframe in a first radio frame from which to transmit
the downlink signal for a first cell, is aligned to the boundary of a
subframe in a second radio frame from which to transmit the downlink
signal for a second cell, and in this preceding step, the number of OFDM
symbols used for transmitting the downlink control signal and the
downlink data signal in each subframe within the first radio frame, is
made equal to the number of OFDM symbols used for transmitting the
downlink control signal and the downlink data signal in each subframe
within the second radio frame.

[0022] A gist of an eleventh characteristic of the present invention is a
simulation method including: a step A in which a physical cell ID is
assigned to a first cell and a second cell; and a step B in which the
downlink signal for a first cell is transmitted by a first frequency
direction resource determined by a physical cell ID imparted to the first
cell, and the downlink signal for a second cell is transmitted by a
second frequency direction resource determined by a physical cell ID
imparted to the second cell, in the form of a simulation signal, to a
mobile station, in which in this step A, the physical cell ID is assigned
to the first cell and the second cell so that the first frequency
direction resource and the second frequency direction resource do not
overlap.

[0023] A gist of a twelfth characteristic of the present invention is a
simulation method including: a step A of assigning a first frequency
direction resource by which to transmit a downlink signal for a first
cell, and a second frequency direction resource by which to transmit a
downlink signal for a second cell; and a step B of transmitting the
downlink signal for a first cell by the first frequency direction
resource, and transmitting the downlink signal for a second cell by the
second frequency direction resource, in the form of a simulation signal,
to a mobile station, in which in the step A, frequency direction
resources that can be used for transmitting the downlink signal for a
first cell and the downlink signal for a second cell, is divided in the
frequency directions into a plurality of groups, and one of a plurality
of divided groups is each assigned as the first frequency direction
resource and the second frequency direction resource, and in the step A,
the group assigned as the first frequency direction resource is differed
from the group assigned as the second frequency direction resource.

[0024] A gist of a thirteenth characteristic of the present invention is a
simulation method including a step of transmitting at least one of
broadcast information for a first cell or a synchronization signal within
a first predetermined period, and transmitting at least one of broadcast
information for a second cell or a synchronization signal within a second
predetermined period, in the form of a simulation signal, to a mobile
station, in which in this preceding step, the transmission timing of at
least one of the broadcast information for a first cell or the
synchronization signal is differed from the transmission timing of at
least one of the broadcast information for a second cell or the
synchronization signal.

[0025] A gist of a fourteenth characteristic of the present invention is a
simulation method including a step of transmitting the broadcast
information for a first cell within a first predetermined period, and
transmitting a downlink signal for a second cell, in the form of a
simulation signal, to a mobile station, in which in this preceding step,
the downlink signal for a second cell is not transmitted at the
transmission timing of the broadcast information for a first cell.

[0026] A gist of a fifteenth characteristic of the present invention is a
simulation method including a step of transmitting a downlink data signal
for a specific cell via a physical downlink data channel, in the form of
a simulation signal, to a mobile station, in which in this preceding
step, transmission of the downlink signal via the physical downlink data
channel is stopped when there is no downlink data signal for a specific
cell that should be transmitted.

[0027] A gist of a sixteenth characteristic of the present invention is a
simulation method including a step A of assigning a first frequency
direction resource by which to transmit a downlink data signal for a
first cell, and a second frequency direction resource by which to
transmit a downlink data signal for a second cell; and a step B of
transmitting the downlink data signal for a first cell by the first
frequency direction resource, and the downlink data signal for a second
cell by the second frequency direction resource, in the form of a
simulation signal, to a mobile station, in which in the step A, a
predetermined number of frequency direction resources centered on the
frequency direction resource in the center are not assigned, out of the
frequency direction resources that can be used, for transmitting the
downlink signal for a first cell and the downlink signal for a second
cell, as the first frequency direction resource and the second frequency
direction resource.

Effect of the Invention

[0028] As described above, according to the present invention, it is
possible to provide a simulator device and a simulation method by which
it is possible to verify the operation of a mobile station supported by
the LTE scheme.

BRIEF DESCRIPTION OF THE DRAWINGS

[0029]FIG. 1 is a diagram showing an entire configuration of a mobile
communication system according to the first embodiment.

[0030]FIG. 2 is a diagram explaining an operation of a function 1 in the
simulator device according to the first embodiment of the present
invention.

[0031]FIG. 3 is a diagram explaining an operation of the function 1 in
the simulator device according to the first embodiment of the present
invention.

[0032]FIG. 4 is a diagram explaining an operation of the function 1 in
the simulator device according to the first embodiment of the present
invention.

[0033]FIG. 5 is a diagram explaining an operation of the function 1 in
the simulator device according to the first embodiment of the present
invention.

[0034]FIG. 6 is a diagram explaining an operation of a function 2 in the
simulator device according to the first embodiment of the present
invention.

[0035] FIG. 7 is a diagram explaining an operation of the function 2 in
the simulator device according to the first embodiment of the present
invention.

[0036] FIG. 8 is a diagram explaining an operation of a function 3 in the
simulator device according to the first embodiment of the present
invention.

[0037]FIG. 9 is a diagram explaining an operation of the function 3 in
the simulator device according to the first embodiment of the present
invention.

[0038]FIG. 10 is a diagram explaining an operation of a function 4 in the
simulator device according to the first embodiment of the present
invention.

[0039] FIG. 11 is a diagram explaining an operation of the function 4 in
the simulator device according to the first embodiment of the present
invention.

[0040] FIG. 12 is a diagram explaining an operation of a function 5 in the
simulator device according to the first embodiment of the present
invention.

[0041]FIG. 13 is a diagram explaining an operation of the xfunction 5 in
the simulator device according to the first embodiment of the present
invention.

[0042]FIG. 14 is a diagram explaining an operation of a function 6 in the
simulator device according to the first embodiment of the present
invention.

[0043]FIG. 15 is a diagram explaining an operation of the function 6 in
the simulator device according to the first embodiment of the present
invention.

[0044] FIG. 16 is a diagram explaining an operation of a function 7 in the
simulator device according to the first embodiment of the present
invention.

[0045]FIG. 17 is a diagram explaining an operation of a function 8 in the
simulator device according to the first embodiment of the present
invention.

[0046]FIG. 18 is a diagram explaining an operation of the function 8 in
the simulator device according to the first embodiment of the present
invention.

[0047]FIG. 19 is a diagram explaining an operation of when the functions
1 through 8 are running in the simulator device according to the first
embodiment of the present invention.

[0048]FIG. 20 is a diagram showing an example of a combination of a
physical channel or physical signal using each function in the simulator
device according to the first embodiment of the present invention.

BEST MODES FOR CARRYING OUT THE INVENTION

Simulator Device According to First Embodiment of the Present Invention

[0049] A simulator device 20 according to the first embodiment of the
present invention is described with reference to FIG. 1 through FIG. 20.

[0050] As shown in FIG. 1, the simulator device 20 according to the
present embodiment is configured to simulate an operation of a radio base
station eNB of an LTE scheme (that is, an operation of a plurality of
cells), and includes at least one of the functions 1 through 8 described
later. Note that in the present embodiment, an example in which the
simulator device 20 simulates an operation of cells 1 through 3 is
explained, but the simulator 20 may also be configured to simulate the
operation of a greater number of cells. Alternatively, the simulator 20
may also be configured to simulate an operation of a smaller number of
cells.

[0051] The simulator device 20 is configured to transmit a downlink
signal, including a downlink signal for a cell 1 through downlink signal
for a cell 3, to a mobile station UE, in the form of a simulation signal.

[0052] The operation, of the functions 1 through 8 that can be included in
the simulator device 20, is explained below.

[0055] The cell simulation units 1 through 3 are configured to
respectively generate a downlink signal for a cell 1 through a downlink
signal for a cell 3, in the form of a simulation signal.

[0056] The downlink signal transmission timing adjustment unit 21 is
configured to adjust the transmission timing of the downlink signal for a
cell 1 through the downlink signal for a cell 3, and then synthesize
these timings.

[0057] The downlink signal output unit 22 is configured to transmit a
downlink signal, including the downlink signal for a cell 1 through the
downlink signal for a cell 3 which are synthesized by the downlink signal
transmission timing adjustment unit 21, to the mobile station UE.

[0058] Here, the downlink signal transmission timing adjustment unit 21
and the downlink signal output unit 22 may be separate units, or may be
formed as a single unit.

[0059] Furthermore, it is summarized that the downlink signal output unit
22 (or the downlink signal transmission timing adjustment unit 21) is
configured to shift a lead position of a radio frame from which to
transmit a downlink signal for a cell 1, a lead position of a radio frame
from which to transmit a downlink signal for a cell 2, and a lead
position of a radio frame from which to transmit a downlink signal for a
cell 3, upon receiving an instruction from the downlink signal
transmission timing adjustment unit 21.

[0060] Here, the downlink signal output unit 22 (or the downlink signal
transmission timing adjustment unit 21) may be configured to shift the
lead position, of the radio frame from which to transmit the downlink
signal for each cell, by only a predetermined number (for example, one)
of subframes, or may be configured to shift the lead position of the
radio frame from which to transmit the downlink signal for each cell by
only a predetermined number (for example, one) of OFDM symbols.

[0061]FIG. 3 shows an example when, each of the lead position of the
radio frame from which to transmit a downlink signal for a cell 1 through
the lead position of the radio frame from which to transmit a downlink
signal for a cell 3 (that is, the boundary of each radio frame), is
shifted by only one subframe. Here, subframes 0 through 9 constitute one
radio frame, and subframe 0 is the lead position of each radio frame.

[0062] Furthermore, each subframe may be configured from two slots each.
Furthermore, each slot may be configured from seven OFDM symbols each.

[0063] In the example of FIG. 4, the downlink signal for a cell 1 is
configured in such way that, an S-SS (Secondary-Synchronization Signal)
is transmitted by the fifth OFDM symbol of the first half of the slot in
the subframe 0, a P-SS (Primary-Synchronization Signal) is transmitted by
the sixth OFDM symbol subframe 6 of the first half of the slot in the
subframe 0, and a signal for PBCH (Physical Broadcast Channel) is
transmitted by the 0th through third OFDM symbol of the latter half of
the slot in the subframe 0.

[0064] Similarly, the downlink signal for a cell 2 is configured in such
way that an S-SS is sent by the fifth OFDM symbol of the first half of
the slot in the subframe 0, a P-SS is sent by the sixth OFDM symbol of
the first half of the slot in the subframe 0, and a signal for PBCH is
sent by the 0th through third OFDM symbol of the latter half of the slot
in the subframe 0.

[0065] Here, P-SS and S-SS are transmitted in a five-subframe cycle, and
the signal for PBCH is transmitted in a 10-subframe cycle. Therefore, as
described above, if the lead position of the radio frame from which to
transmit a downlink signal for a cell 1 and the lead position of the
radio frame from which to transmit a downlink signal for a cell 2 is
shifted by only one subframe, the transmission timing of S-SS, P-SS, and
the signal for PBCH shifts between cell 1 and cell 2, and the situation
of mutual interference can be avoided.

[0066] Note that as shown in FIG. 5, the function 1 includes a function
unit 1, which is configured by a timing adjustment unit 23, cell
simulation units 1 through 3, and a downlink signal output unit 22.

[0067] Here, the timing adjustment unit 23 is configured to adjust the
timing of generation, of the downlink signal for a cell 1 through
downlink signal for a cell 3, in each of the cell simulation units 1
through 3.

[0068] The timing adjustment unit 23 is configured, to adjust the timing
of generation of the downlink signal for each cell, so that the lead
position of the radio frame from which to transmit the downlink signal
for each cell is shifted.

[0069] The cell simulation units 1 through 3 are configured, to generate
the downlink signal for a cell 1 through downlink signal for a cell 3 at
the timing specified based on the timing adjustment information received
from the timing adjustment unit 23, and then to transmit these downlink
signals to the downlink signal output unit 22.

[0070] The downlink signal output unit 22 is configured to synthesize the
downlink signal for a cell 1 through downlink signal for a cell 3
transmitted by the cell simulation units 1 through 3, and then to
transmit this signal to the mobile station UE as a simulation signal.

[0073] The timing adjustment unit 23 is configured to adjust, the lead
position of the subframes in the radio frame from which to transmit the
downlink signal for each cell, that is, the boundary of the subframes in
each radio frame.

[0074] Specifically, the timing adjustment unit 23 is configured to align
the lead position of the subframes in the radio frame from which to
transmit the downlink signal for each cell. In other words, the timing
adjustment unit 23 is configured to align the boundary of the subframes
in each radio frame.

[0075] The OFDM symbol count specification unit 24 is configured to
specify the number of OFDM symbols used, to transmit a signal (downlink
control signal) for PDCCH (Physical Downlink Control Channel) and a
signal (downlink data signal) for PDSCH (Physical Downlink Shared
Channel), in each subframe of each radio frame.

[0076] Specifically, the OFDM symbol count specification unit 24 is
configured to specify the number of OFDM symbols used, for transmitting
the signal for PDCHH and the signal for PDSCH in each subframe of each
radio frame, so that this number becomes the same.

[0077] As shown in FIG. 7, in the LTE scheme, one subframe is configured
by, for example, 14 OFDM symbols. Furthermore, the signal for PDCCH and
the signal for PDSCH are configured to be transmitted in the same
subframe. Note that a variable control may be performed for the number of
OFDM symbols used for transmitting the signal for PDCCH and the signal
for PDSCH, or these symbols may have a fixed value.

[0078] Specifically, the number of OFDM symbols of the signal for PDCCH
can be taken as 1, 2, and 3, and in such a case, the number of OFDM
symbols of the signal for PDSCH becomes 13, 12, and 11, respectively.

[0079] In the example of FIG. 7, the OFDM symbol count specification unit
24 is configured, to specify "3" as the number of OFDM symbols used for
transmitting the signal for PDCCH, and to specify "11" as the number of
OFDM symbols used for transmitting the signal for PDSCH, for the cell
simulation units 1 through 3.

[0080] The cell simulation units 1 through 3 are configured to generate
the downlink signal for a cell 1 through downlink signal for a cell 3,
including the signal for PDCCH and the signal for PDSCH based on the
timing adjustment information received from the timing adjustment unit 23
and the number of OFDM symbols received from the OFDM symbol count
specification unit 24.

[0081] Specifically, the cell simulation units 1 through 3 are configured
to adjust the lead position of the subframes in the radio frames
configured to transmit the downlink signal for a cell 1 through downlink
signal for a cell 3 based on the timing adjustment information received
from the timing adjustment unit 23, and to map the signal for PDCCH and
the signal for PDSCH in each subframe of each radio frame based on the
number of OFDM symbols received from the OFDM symbol count specification
unit 24.

[0082] The downlink signal output unit 22 is configured to synthesize a
downlink signal for a cell 1 through downlink signal for a cell 3
transmitted by the cell simulation units 1 through 3, and then to
transmit this signal to the mobile station UE as a simulation signal.

[0083] According to the function 2, because the transmission timing of the
signal for PDCCH for a cell 1 and the transmission timing of the signal
for PDSCH for cells 2 and 3 are shifted, mutual interference can be
avoided.

[0086] The PCI assignment unit 25 is configured to assign PCI to each
cell.

[0087] The cell simulation units 1 through 3 are configured to generate RS
(Reference Signal) for each cell, as the downlink signal for each cell.

[0088] The downlink output unit 22 is configured to transmit the RS for
each cell (downlink signal for each cell) by a frequency direction
resource determined by the PCI assigned to each cell.

[0089] Here, as shown in FIG. 9, the PCI assignment unit 25 is configured
to assign PCI to each cell so that the frequency direction resource used
for transmitting the RS for each cell does not overlap.

[0090] For example, a serial number (1 through 6) is assigned to each cell
simulation unit, and the PCI assignment unit 25 is configured to assign
the number (which is serial number-1) as the PCI to a cell corresponding
to each cell simulation unit.

[0091] According to the function 3, because the frequency direction
resource used for transmitting the RS for each cell does not overlap,
interference between the RS for each cell can be prevented.

[0095] Specifically, as shown in FIG. 11, the resource assignment unit 26
is configured to divide resource blocks (frequency direction resources),
that can be used to transmit a downlink signal for each cell, into a
plurality of groups in the frequency direction, and to assign one of
these divided plurality of groups as resource blocks to be used for
transmitting the downlink signal for each cell.

[0096] For example, the resource assignment unit 26 is configured to set,
a group assigned as resource blocks (the first resource block) used for
transmitting a downlink signal for a cell 1, and a group assigned as
resource blocks (the second resource block) used for transmitting a
downlink signal for a cell 2, as separate groups.

[0097] As shown in the example in FIG. 11, when the bandwidth of a
frequency resource that can be used for transmitting a downlink signal
for each cell is "5 MHz", 25 resource blocks are included in the said
bandwidth, and therefore, when the simulator device 20 is configured to
simulate an operation of six cells, the resource assignment unit 26 is
configured to assign a group including four resource blocks, as resource
blocks used for transmitting a downlink signal for each cell.

[0098] In such a case, for example, a serial number (1 to 6) is assigned
to each cell simulation unit, and the resource assignment unit 26 is
configured to assign, a group including four resource blocks with
resource blocks having a resource block number as "4×(serial
number-1)" in the lead, as the resource block used for transmitting a
downlink signal for the cells corresponding to each cell simulation unit.

[0099] Note that the resource assignment unit 26 may be configured to
assign discontinuous resource blocks, or to assign resource blocks of
different sizes as the resource blocks used for transmitting the downlink
signal for cells.

[0100] The downlink signal output unit 22 is configured to transmit a
downlink signal for each cell using resource blocks assigned by the
resource assignment unit 26.

[0101] According to the function 4, because the resource blocks used for
transmitting a downlink signal for each cell do not overlap in the
frequency direction, interference between the downlink signal for each
cell can be prevented.

[0102] Note that the above-mentioned downlink signal for each cell may
include a signal for a downlink shared channel (DL-SCH), a signal for a
dynamic broadcast channel (D-BCH), a signal for SIB (System Information
Block), SI (System information), a paging channel, a random access
response signal (RA response), and a signal for MBMS.

[0105] The downlink signal output unit 22 is configured to transmit the SI
(broadcast information) for each cell to the mobile station UE, as a
simulation signal, within the predetermined time period referred to as
the SI (System Information) window for each cell.

[0106] For example, the downlink signal output unit 22 is configured to
transmit the SI (broadcast information) for a cell 1 within the first S1
window (the first predetermined time period), to transmit the SI for a
cell 2 within the second S1 window (the second predetermined time
period), and to transmit the SI for a cell 3 within the third SI window
(the third predetermined time period), to the mobile station UE, as a
simulation signal.

[0107] The SI timing adjustment unit 27 is configured to adjust the
transmission timing (for example, subframe) of the SI for each cell.

[0108] Specifically, as shown in FIG. 13, the SI timing adjustment unit 27
is configured to adjust the transmission timing of the SI for each cell
so that the transmission timing of the SI for each cell does not overlap.
In other words, the transmission timing of the SI for each cell is of a
different timing.

[0109] Note that the start timing of the SI window for each cell may be
matching, or different.

[0110] For example, when a serial number (1 to 6) is assigned to each cell
simulation unit, and the start timing of the SI window for each cell is
matching, the SI timing adjustment unit 27 is configured to transmit the
SI for each cell by a subframe numbered "3×(serial number-1)" in
the SI window for each cell.

[0111] The cell simulation units 1 through 3 are configured to generate a
downlink signal for each cell, so that the SI for each cell is
transmitted by a subframe specified by the SI timing adjustment unit 27.

[0112] According to the function 5, the SI for each cell can be
transmitted at a different transmission timing, and therefore as a
result, interference between the SI for each cell can be prevented.

[0115] The downlink signal output unit 22 is configured to transmit the SI
for each cell and the signal (downlink data signal) for PDSCH other than
the SI, to the mobile station UE, as a simulation signal. Here, the
downlink signal output unit 22 is configured to transmit the SI for each
cell via PDSCH in the SI window for each cell.

[0116] The PDSCH timing adjustment unit 28 is configured to adjust the
transmission timing (for example, subframe) of the above-mentioned signal
for PDSCH other than SI.

[0117] Specifically, as shown in FIG. 15, the PDSCH timing adjustment unit
28 is configured so that the signal for PDSCH for a cell 1 and the signal
for PDSCH for a cell 2 are not transmitted at the transmission timing of
SI for a cell 1.

[0118] For example, the SI timing adjustment unit 27 may adjust the
transmission timing of the SI for a cell 1 to be delayed by one subframe,
in cases where the transmission timing of the SI for a cell 1, and the
transmission timing of the signals other than SI for PDSCH for a cell 1
(or cell 2), overlap.

[0119] Alternatively, the SI timing adjustment unit 27 may adjust the
transmission timing of the signals other than the SI for PDSCH for a cell
1 (or cell 2) to be delayed by one subframe, in cases where the
transmission timing of the SI for a cell 1 and the transmission timing of
the signals other than SI for PDSCH for a cell 1 (or cell 2), overlap.

[0120] Alternatively, the SI timing adjustment unit 27 may adjust the
transmission timing of the SI for a cell 1 to be delayed to the SI window
for the next cell 1, in cases where the transmission timing of the SI for
a cell 1 and the transmission timing of the signals other than SI for
PDSCH for a cell 1 (or cell 2), overlap.

[0121] Alternatively, the SI timing adjustment unit 27 may perform a
process so the SI for the corresponding cell 1 is not transmitted, in
case where the transmission timing of the SI for a cell 1 and the
transmission timing of the signals other than SI for PDSCH for a cell 1
(or cell 2), overlap.

[0122] The cell simulation units 1 through 3 are configured to generate a
downlink signal for each cell so as to transmit the SI for each cell by a
subframe specified by the SI timing adjustment unit 27, and to transmit
the signals other than SI for PDSCH for each cell by a subframe specified
by the PDSCH timing adjustment unit 28.

[0123] <Function 7>

[0124] As shown in FIG. 16, the function unit 7 is configured by a
judgment unit 29, cell simulation units 1 through 3, and a downlink
signal output unit 22.

[0125] The judgment unit 29 is configured to determine whether or not a
downlink data signal for each cell, which must be transmitted,
specifically, a signal for PDSCH for each cell which must be transmitted,
exists.

[0126] The cell simulation units 1 through 3 are configured to generate,
respectively, the signal for PDSCH for a cell 1 through the signal for
PDSCH for a cell 3 when it is determined that the downlink data signal to
be transmitted does exist, and to not generate the signal for PDSCH for a
cell 1 through the signal for PDSCH for a cell 3 when it is determined
that the downlink data signal to be transmitted does not exist.

[0127] As a result, the downlink signal output unit 22 transmits a PDSCH
signal, only when a downlink data signal for a specific cell which must
be transmitted exists, and stops the transmission of a PDSCH signal when
a downlink data signal for a specific cell which must be transmitted does
not exist.

[0128] According to the function 7, because the configuration is in such
way that a signal for PDSCH is not transmitted, when a downlink data
signal for a specific cell which must be transmitted does not exist, the
interference between the PDSCH signals for different cells can be
prevented as much as possible.

[0131] The resource limiting unit 30 is configured to limit the frequency
direction resources, which can be assigned as frequency direction
resources configured to transmit a downlink signal for each cell.

[0132] The resource assignment unit 26 is configured to assign a frequency
direction resource configured to transmit a downlink signal for each
cell, under consideration of the limiting status of the resource limiting
unit 30.

[0133] The downlink signal output unit 22 is configured to transmit a
downlink signal for each cell by a frequency direction resource assigned
by the resource assignment unit 26, to the mobile station UE, as a
simulation signal.

[0134] Here, as shown in FIG. 18, the resource assignment unit 26 is
configured in such way that, out of the frequency direction resources
that can be used for transmitting a downlink signal for each cell, a
predetermined number of frequency direction resources, centered around
the frequency direction resource in the center, are not assigned as
frequency direction resources to be used for transmitting a signal
(downlink data signal) for PDSCH for each cell.

[0135] Note that the frequency direction resources in the center are used
to transmit signals for P-SS, S-SS, and P-BCH (Physical BCH).

[0136] Thus, in other words, the resource assignment unit 26 is configured
in a manner such that, out of the frequency direction resources that can
be used for transmitting a downlink signal for each cell, the frequency
direction resources that transmit a P-SS, S-SS, and broadcast
information, are not assigned as frequency direction resources to be used
for transmitting a signal (downlink data signal) for PDSCH for each cell.

[0137] Specifically, if an even number of resource blocks are included
within the bandwidth of the frequency direction resources that can be
used for transmitting a downlink signal for each cell, the resource
assignment unit 26 may be configured such that the six resource blocks
centered, around the frequency direction resource in the center, are not
assigned as resource blocks to be used for transmitting a signal for
PDSCH for each cell.

[0138] On the other hand, if an odd number of resource blocks are included
within the bandwidth of the frequency direction resources that can be
used for transmitting a downlink signal for each cell, the resource
assignment unit 26 may be configured such that the seven resource blocks
centered, around the frequency direction resource in the center, are not
assigned as resource blocks to be used for transmitting a signal for
PDSCH for each cell.

[0139] For example, when the bandwidth of the frequency direction
resources that can be used for transmitting a downlink signal for each
cell is "5 MHz", 25 resource blocks are included in the said bandwidth.
Therefore, the resource assignment unit 26 may be configured such that
the seven resource blocks, centered on the frequency direction resource
in the center, are not assigned as resource blocks to be used for
transmitting a signal for PDSCH for each cell.

[0140] According to the function 8, out of the frequency direction
resources that can be used for transmitting a downlink signal for each
cell, a predetermined number of frequency direction resources centered on
the frequency direction resource in the center, that are used to transmit
a P-SS and S-SS, are not assigned as frequency direction resources used
for transmitting a signal for PDSCH for each cell. Therefore,
interference between the signal for PDSCH, and P-SS and/or S-SS, can be
prevented.

[0141] Note that in the above explanation, an example of applying the
functions 1 through 8 in three cells was shown. However, the functions 1
through 8 may also be applied to two cells, or four or more cells. In
such cases, the above-mentioned functions 1 through 8 are applied in a
manner such that no interference occurs between the two cells, or among
the four or more cells.

[0142] (Modification)

[0143]FIG. 19 shows a modification of the simulator device 20 according
to the first embodiment of the present invention.

[0144] As shown in FIG. 19, the simulator device 20 includes all of the
functions 1 through 8, and is configured to individually turn each
function "ON" or "OFF". The operation of each of the functions 1 through
8 is basically the same as functions 1 through 8 in the simulator device
20 according to the above-mentioned first embodiment.

[0145] Here, the configuration is such that when the function 6 is "ON",
the output of function 5 is transmitted to the function 6, and when the
function 6 is "OFF", the output of the function 5 is transmitted to each
cell simulation unit.

[0146] Similarly, the configuration is such that when the function 4 is
"ON", the output of the function 8 is transmitted to the function 4, and
when the function 4 is "OFF", the output of the function 8 is transmitted
to each cell simulation unit.

[0147] Note that the relationship, between the combination of a physical
channel or physical signal and the functions that can be applied to the
combination, is explained with reference to FIG. 20.

[0148] As shown in FIG. 20, when the downlink signal for a cell 1 is P-SS
or S-SS, and the downlink signal for a cell 2 is P-SS or S-SS, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 xcan be completely eliminated by turning the function
1 "ON".

[0149] Furthermore, when the downlink signal for a cell 1 is P-SS or S-SS,
and the downlink signal for a cell 2 is RS, the interference between the
downlink signal for a cell 1 and the downlink signal for a cell 2 can be
completely eliminated by turning the function 1 "ON".

[0150] Furthermore, when the downlink signal for a cell 1 is P-SS or S-SS,
and the downlink signal for a cell 2 is a signal for PBCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
1 "ON".

[0151] Furthermore, when the downlink signal for a cell 1 is P-SS or S-SS,
and the downlink signal for a cell 2 is a signal for PCFICH (Physical
Control Format Indicator Channel), the interference between the downlink
signal for a cell 1 and the downlink signal for a cell 2 can be
completely eliminated by turning the function 1 "ON".

[0152] Furthermore, when the downlink signal for a cell 1 is P-SS or S-SS,
and the downlink signal for a cell 2 is a signal for PDCCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
1 "ON".

[0153] Furthermore, when the downlink signal for a cell 1 is P-SS or S-SS,
and the downlink signal for a cell 2 is a signal for PHICH (Physical HARQ
Indicator Channel), the interference between the downlink signal for a
cell 1 and the downlink signal for a cell 2 can be completely eliminated
by turning the function 1 "ON".

[0154] When the downlink signal for a cell 1 is P-SS or S-SS, and the
downlink signal for a cell 2 is a signal for PDSCH, the interference
between the downlink signal for a cell 8 and the downlink signal for a
cell 2 can be completely eliminated by turning the function 1 "ON".

[0155] Even when the downlink signal for a cell 1 is RS, and the downlink
signal for a cell 2 is RS, the interference between the downlink signal
for a cell 3 and the downlink signal for a cell 2 can be completely
eliminated by turning the function 3 "ON".

[0156] Furthermore, even when the downlink signal for a cell 1 is RS, and
the downlink signal for a cell 2 is a signal for PDCCH, the interference
between the downlink signal for a cell 5 and the downlink signal for a
cell 2 can be completely eliminated by turning the functions 5, 6, and 7
"ON".

[0157] Furthermore, even when the downlink signal for a cell 1 is RS, and
the downlink signal for a cell 2 is a signal for PDSCH, the interference
between the downlink signal for a cell 5 and the downlink signal for a
cell 2 can be completely eliminated by turning the functions 4, 5, 6, and
7 "ON".

[0158] When the downlink signal for a cell 1 is a signal for PBCH, and the
downlink signal for a cell 2 is a signal for PBCH, the interference
between the downlink signal for a cell 1 and the downlink signal for a
cell 2 can be completely eliminated by turning the function 1 "ON".

[0159] Furthermore, when the downlink signal for a cell 1 is a signal for
PBCH, and the downlink signal for a cell 2 is a signal for PCFICH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
1 "ON".

[0160] Furthermore, when the downlink signal for a cell 1 is a signal for
PBCH, and the downlink signal for a cell 2 is a signal for PDCCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
1 "ON".

[0161] Furthermore, when the downlink signal for a cell 1 is a signal for
PBCH, and the downlink signal for a cell 2 is a signal for PHICH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
1 "ON".

[0162] Furthermore, when the downlink signal for a cell 1 is a signal for
PBCH, and the downlink signal for a cell 2 is a signal for PDSCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
8 "ON".

[0163] When the downlink signal for a cell 1 is a signal for PCFICH, and
the downlink signal for a cell 2 is a signal for PCFICH, the interference
between the downlink signal for a cell 1 and the downlink signal for a
cell 2 can be completely eliminated by turning the function 3 "ON".

[0164] Furthermore, even when the downlink signal for a cell 1 is PCFICH,
and the downlink signal for a cell 2 is a signal for PDCCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the functions
5, 6, and 7 "ON".

[0165] Furthermore, when the downlink signal for a cell 1 is a signal for
PCFICH, and the downlink signal for a cell 2 is a signal for PDSCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
1 "ON".

[0166] When the downlink signal for a cell 1 is a signal for PDCCH, and
the downlink signal for a cell 2 is a signal for PDCCH, the interference
between the downlink signal for a cell 1 and the downlink signal for a
cell 2 can be completely eliminated by turning the functions 5, 6, and 7
"ON".

[0167] Furthermore, even when the downlink signal for a cell 1 is a signal
for PDCCH, and the downlink signal for a cell 2 is a signal for PHICH,
the interference between the downlink signal for a cell 1 and the
downlink signal for a cell 2 can be completely eliminated by turning the
functions 5, 6, and 7 "ON".

[0168] Furthermore, when the downlink signal for a cell 1 is a signal for
PDCCH, and the downlink signal for a cell 2 is a signal for PDSCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
2 "ON".

[0169] When the downlink signal for a cell 1 is a signal for PHICH, and
the downlink signal for a cell 2 is a signal for PHICH, the interference
between the downlink signal for a cell 1 and the downlink signal for a
cell 2 can be completely eliminated by turning the function 3 "ON".

[0170] Furthermore, when the downlink signal for a cell 1 is a signal for
PHICH, and the downlink signal for a cell 2 is a signal for PDSCH, the
interference between the downlink signal for a cell 1 and the downlink
signal for a cell 2 can be completely eliminated by turning the function
2 "ON".

[0171] When the downlink signal for a cell 1 is a signal for PDSCH, and
the downlink signal for a cell 2 is a signal for PDSCH, the interference
between the downlink signal for a cell 1 and the downlink signal for a
cell 2 can be completely eliminated by turning the functions 4, 5, 6, and
7 "ON".

[0172] The characteristics of the present embodiment as described above
may be expressed as follows:

[0173] A gist of a first characteristic of the present embodiment is a
simulator device 20 including a downlink signal output unit 22 configured
to transmit a downlink signal for a cell 1 (first cell) and transmit a
downlink signal for a cell 2 (second cell), in the form of a simulation
signal, to a mobile station UE, in which the downlink signal output unit
22 is configured to shift the lead position of a radio frame from which
to transmit the downlink signal for a cell 1, and the lead position of a
radio frame from which to transmit the downlink signal for a cell 2.

[0174] A gist of a second characteristic of the present embodiment is a
simulator device 20 including a downlink signal output unit 22 configured
to transmit a downlink signal for a cell 1 including a signal for PDCCH
(downlink control signal) and a signal for PDSCH (downlink data signal),
and to transmit a downlink signal for a cell 2 including the signal for
PDCCH and the signal for PDSCH, in the form of a simulation signal, to a
mobile station UE, in which the downlink signal output unit 22 is
configured to align the boundary of a subframe in a first radio frame
from which to transmit the downlink signal for a cell 1, and the boundary
of a subframe in a second radio frame from which to transmit the downlink
signal for a cell 2, and the downlink signal output unit 22 is configured
to make the number of OFDM symbols used for transmitting the signal for
PDCCH and the signal for PDSCH in each subframe within the first radio
frame, equal to the number of OFDM symbols used for transmitting the
signal for PDCCH and the signal for PDSCH in each subframe within the
second radio frame.

[0175] A gist of a third characteristic of the present embodiment is a
simulator device 20 including: a PCI assignment unit 25 configured to
assign PCI (physical cell ID) to a cell 1 (first cell) and a cell 2
(second cell); and a downlink signal output unit 22 configured to
transmit the downlink signal for a cell 1 by a first frequency direction
resource determined by PCI imparted to the cell 1, and to transmit the
downlink signal for a cell 2 by a second frequency direction resource
determined by PCI imparted to a cell 2, to a mobile station UE, in the
form of a simulation signal, in which the PCI assignment unit 25 is
configured to assign PCI to the cell 1 and the cell 2 so that the first
frequency direction resource and the second frequency direction resource
do not overlap.

[0176] A gist of a fourth characteristic of the present embodiment is a
simulator device 20 including: a resource assignment unit 26 configured
to assign a first resource block (first frequency direction resource) by
which to transmit a downlink signal for a cell 1, and a second resource
block (second frequency direction resource) by which to transmit a
downlink signal for a cell 2; and a downlink signal output unit 22
configured to transmit the downlink signal for a cell 1 by the first
resource block, and the downlink signal for a cell 2 by the second
resource block, to a mobile station UE, in the form of a simulation
signal, in which the resource assignment unit 26 is configured to divide
the resource blocks (frequency direction resources) that can be used for
transmitting the downlink signal for a cell 1 and the downlink signal for
a cell 2, in the frequency directions into a plurality of groups, and to
assign one of a plurality of divided groups, as the first resource block
and the second resource block, and the resource assignment unit 26 is
configured such that the group assigned as the first resource block is
differed from the group assigned as the second resource block.

[0177] A gist of a fifth characteristic of the present embodiment is a
simulator device 20 including a downlink signal output unit 22 configured
to transmit at least one of SI (broadcast information) for a cell 1 or a
synchronization signal within a first SI window (first predetermined
period), and to transmit at least one of SI for a cell 2 or a
synchronization signal within a second SI window (second predetermined
period), in the form of a simulation signal, to a mobile station UE, in
which the downlink signal output unit 22 is configured such that the
transmission timing of at least one of the SI for a cell 1 or the
synchronization signal is differed from the transmission timing of at
least one of the SI for a cell 2 or the synchronization signal.

[0178] A gist of a sixth characteristic of the present embodiment is a
simulator device 20 including a downlink signal output unit 22 configured
to transmit SI for a cell 1 within a first SI window, and to transmit a
downlink signal for a cell 2, in the form of a simulation signal, to a
mobile station UE, in which the downlink signal output unit 22 is
configured to not transmit the downlink signal for a cell 2 at the
transmission timing of the SI for a cell 1.

[0179] A gist of a seventh characteristic of the present embodiment is a
simulator device 20 including a downlink signal output unit 22 configured
to transmit a downlink data signal for a specific cell via PDSCH
(physical downlink data channel), in the form of a simulation signal, to
a mobile station UE, in which the downlink signal output unit 22 is
configured, to stop the transmission of the PDSCH signal, when there is
no downlink data signal for a specific cell that should be transmitted.

[0180] A gist of an eighth characteristic of the present embodiment is a
simulator device 20 including: a resource assignment unit 26 configured
to assign a first frequency direction resource by which to transmit a
downlink data signal for a cell 1, and a second frequency direction
resource by which to transmit a downlink data signal for a second cell;
and a downlink signal output unit 22 configured to transmit the downlink
data signal for a cell 1 by the first frequency direction resource, and
the downlink data signal for a cell 2 by the second frequency direction
resource, in the form of a simulation signal, to a mobile station UE, in
which the resource assignment unit 26 is configured not to assign a
predetermined number of frequency direction resources centered on the
frequency direction resource in the center, out of the frequency
direction resources that can be used for transmitting the downlink signal
for a cell 1 and the downlink signal for a cell 2, as the first frequency
direction resource and the second frequency direction resource.

[0181] A gist of a ninth characteristic of the present embodiment is a
simulation method including a step of transmitting a downlink signal for
a cell 1, and transmitting a downlink signal for a cell 2, in the form of
a simulation signal, to a mobile station UE, in which in such a step, the
lead position of a radio frame from which to transmit the downlink signal
for a cell 1 is shifted from the lead position of a radio frame from
which to transmit the downlink signal for a cell 2.

[0182] A gist of a tenth characteristic of the present embodiment is a
simulation method including a step of transmitting a downlink signal for
a cell 1 including a signal for PDCCH (downlink control signal) and a
signal for PDSCH (downlink data signal), and transmitting a downlink
signal for a cell 2 including the signal for PDCCH and the signal for
PDSCH, in the form of a simulation signal, to a mobile station UE, in
which in such a step, the boundary of a subframe in a first radio frame
from which to transmit the downlink signal for a cell 1 is aligned to the
boundary of a subframe in a second radio frame from which to transmit the
downlink signal for a cell 2, and in such a step, the number of OFDM
symbols used for transmitting the signal for PDCCH and the signal for
PDSCH in each subframe within the first radio frame is made equal to the
number of OFDM symbols used for transmitting the signal for PDCCH and the
signal for PDSCH in each subframe within the second radio frame.

[0183] A gist of an eleventh characteristic of the present embodiment is a
simulation method including: a step A in which PCI is assigned to a cell
1 and a cell 2; and a step B in which the downlink signal for a cell 1 is
transmitted by a first frequency direction resource determined by PCI
imparted to the cell 1, and the downlink signal for a cell 2 is
transmitted by a second frequency direction resource determined by PCI
imparted to the cell 2, in the form of a simulation signal, to a mobile
station UE, in which in the step A, the PCI is assigned to the cell 1 and
the cell 2 so that the first frequency direction resource and the second
frequency direction resource do not overlap.

[0184] A gist of a twelfth characteristic of the present embodiment is a
simulation method including: a step A of assigning a first resource block
(first frequency direction resource) by which to transmit a downlink
signal for a cell 1, and a second resource block (second frequency
direction resource) by which to transmit a downlink signal for a cell 2;
and a step B of transmitting the downlink signal for a cell 1 by the
first resource block, and transmitting the downlink signal for a cell 2
by the second resource block, in the form of a simulation signal, to a
mobile station UE, in which in the step A, resource blocks (frequency
direction resources) that can be used for transmitting the downlink
signal for a cell 1 and the downlink signal for a cell 2, are divided in
the frequency directions into a plurality of groups, and one of a
plurality of divided groups is assigned as the first resource block and
the second resource block, and in the step A, the group assigned as the
first resource block is differed from the group assigned as the second
resource block.

[0185] A gist of a thirteenth characteristic of the present embodiment is
a simulation method including a step of transmitting at least one of SI
for a cell 1 or a synchronization signal within a first SI window, and
transmitting at least one of SI broadcast information for a cell 2 or a
synchronization signal within a second SI window, in the form of a
simulation signal, to a mobile station UE, in which in such a step, the
transmission timing of at least one of the SI for a cell 1 or the
synchronization signal is differed from the transmission timing of at
least one of the SI for a cell 2 or the synchronization signal.

[0186] A gist of a fourteenth characteristic of the present embodiment is
a simulation method including a step of transmitting the SI for a cell 1
within a first SI window, and transmitting a downlink signal for a cell
2, in the form of a simulation signal, to a mobile station UE, in which
in the step, the downlink signal for a cell 2 is not transmitted at the
transmission timing of the SI for a cell 1.

[0187] A gist of a fifteenth characteristic of the present embodiment is a
simulation method including a step of transmitting a downlink data signal
for a specific cell via PDSCH, in the form of a simulation signal, to a
mobile station UE, in which in such a step, transmission of the downlink
signal via the PDSCH is stopped when there is no downlink data signal for
a specific cell that should be transmitted.

[0188] A gist of a sixteenth characteristic of the present embodiment is a
simulation method including: a step A of assigning a first frequency
direction resource by which to transmit a downlink data signal for a cell
1, and a second frequency direction resource by which to transmit a
downlink data signal for a cell 2; and a step B of transmitting the
downlink data signal for a cell 1 by the first frequency direction
resource, and the downlink data signal for a cell 2 by the second
frequency direction resource, in the form of a simulation signal, to a
mobile station UE, in which in the step A, a predetermined number of
frequency direction resources centered on the frequency direction
resource in the center are not assigned, out of the frequency direction
resources that can be used for transmitting the downlink signal for a
cell 1 and the downlink signal for a cell 2, as the first frequency
direction resource and the second frequency direction resource.

[0189] It is noted that the operation of the above-described mobile
station UE or the simulator device 20 may be implemented by a hardware,
may also be implemented by a software module executed by a processor, and
may further be implemented by the combination of the both.

[0190] The software module may be arranged in a storage medium of an
arbitrary format such as RAM (Random Access Memory), a flash memory, ROM
(Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM
(Electronically Erasable and Programmable ROM), a register, a hard disk,
a removable disk, and CD-ROM.

[0191] The storage medium is connected to the processor so that the
processor can write and read information into and from the storage
medium. Such a storage medium may also be accumulated in the processor.
The storage medium and processor may be arranged in ASIC. Such the ASIC
may be arranged in the mobile station UE or the simulator device 20.
Further, such a storage medium or a processor may be arranged, as a
discrete component, in the mobile station UE or the simulator device 20.

[0192] Thus, the present invention has been explained in detail by using
the above-described embodiments; however, it is obvious that for persons
skilled in the art, the present invention is not limited to the
embodiments explained herein. The present invention can be implemented as
a corrected and modified mode without departing from the gist and the
scope of the present invention defined by the claims. Therefore, the
description of the specification is intended for explaining the example
only and does not impose any limited meaning to the present invention.